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High-temperature electrolyte for silicon-carbon composite negative electrode and secondary battery

A silicon-carbon composite and secondary battery technology, applied in the field of materials, can solve problems such as easy gas production, shorten battery life, and deteriorate battery performance, and achieve the effects of improving stability and electrical performance, improving high-temperature performance, and preventing damage

Active Publication Date: 2020-11-27
江苏蓝固新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when studying lithium batteries made of silicon-carbon materials, it was found that using the existing commonly used electrolyte system, silicon-carbon negative electrode batteries are prone to gas generation when working at high temperatures, especially as the silicon content increases, the gas generation phenomenon is more obvious, deteriorating the battery performance, seriously shortening battery life

Method used

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  • High-temperature electrolyte for silicon-carbon composite negative electrode and secondary battery
  • High-temperature electrolyte for silicon-carbon composite negative electrode and secondary battery
  • High-temperature electrolyte for silicon-carbon composite negative electrode and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a high-temperature additive A and a high-temperature electrolyte I added with the high-temperature additive A.

[0039] The high-temperature electrolyte A is shown in the following formula:

[0040]

[0041] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2In a glove box of ≤2.0ppm, the organic solvents ethylene carbonate (EC), fluoroethylene carbonate (FEC), diethyl carbonate (DEC), and epoxy molding compound (EMC) are mixed according to the mass ratio EC / FEC / DEC / EMC=22 / 8 / 20 / 50 for mixing, and then adding lithium hexafluorophosphate for dissolution to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1.1M, and then adding the auxiliary additive vinylene carbonate according to the mass fraction of 1%, 0.5%, and 1% respectively (VC), vinyl sulfate (DTD) and LiPO 2 f 2 , and then add 1% high-temperature additive A to prepare high-temperature electrolyte solution I.

Embodiment 2

[0043] This embodiment provides a high-temperature additive B and high-temperature electrolyte II added with the high-temperature additive B.

[0044] The high-temperature electrolyte B is shown in the following formula:

[0045]

[0046] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box of ≤2.0ppm, mix the organic solvents EC, FEC, DEC, and EMC according to the mass ratio EC / FEC / DEC / EMC=22 / 8 / 20 / 50, then add lithium hexafluorophosphate to dissolve, and prepare lithium hexafluorophosphate with a concentration of 1.1 M electrolyte, and then add auxiliary additives VC, DTD and LiPO according to the mass fraction of 1%, 0.5%, and 1% respectively 2 f 2 , and then add 1% high-temperature additive B to prepare high-temperature electrolyte II.

Embodiment 3

[0048] This embodiment provides a high-temperature additive C and a high-temperature electrolyte III added with the high-temperature additive C.

[0049] The high-temperature electrolyte C is shown in the following formula:

[0050]

[0051] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box of ≤2.0ppm, mix the organic solvents EC, FEC, DEC, and EMC according to the mass ratio EC / FEC / DEC / EMC=22 / 8 / 20 / 50, then add lithium hexafluorophosphate to dissolve, and prepare lithium hexafluorophosphate with a concentration of 1.1 M electrolyte, and then add auxiliary additives VC, DTD and LiPO according to the mass fraction of 1%, 0.5%, and 1% respectively 2 f 2 , and then add 1% high-temperature additive C to prepare high-temperature electrolyte solution III.

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Abstract

The invention relates to a high-temperature electrolyte for a silicon-carbon composite negative electrode and a secondary battery. The high-temperature electrolyte comprises a lithium salt electrolyte, an organic solvent, a high-temperature additive and an auxiliary additive, wherein the high-temperature additive is a compound containing anhydride and siloxane structures, and has a structural general formula shown in the specification; in the general formula, X is one of butanedioic anhydride, maleic anhydride, glutaric anhydride and adipic acid anhydride, wherein R is one of alkyl, alkenyl, alkynyl and halogenated derivatives thereof with the carbon atom number of 1-6; the high-temperature electrolyte is used in a silicon-carbon composite negative electrode battery system, and the high-temperature additive accounts for 0.1 wt%-5wt% of the mass of the high-temperature electrolyte.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a high-temperature electrolyte and a secondary battery for a silicon-carbon composite negative electrode. Background technique [0002] Since its commercialization in the 1990s, lithium batteries have been widely used because of their advantages such as high energy density, high charge-discharge efficiency, low self-discharge, long service life, and environmental friendliness. At present, it has been applied to the fields of consumer electronics, aerospace, military, electric tools and electric vehicles. With the development of technology, people have higher and higher requirements for the energy density of lithium-ion batteries, whether it is in the consumer field or the power battery field. The use of positive and negative electrode materials with higher gram capacity has become one of the technologies to improve the energy density of lithium-ion batteries. [0003] At prese...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052H01M2300/0025Y02E60/10
Inventor 高田慧李立飞
Owner 江苏蓝固新能源科技有限公司
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